/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.freecol.client.gui.panel;

import java.awt.event.ActionEvent;
import java.io.File;
import java.util.List;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.filechooser.FileFilter;

import net.sf.freecol.client.FreeColClient;
import net.sf.freecol.client.gui.ChoiceItem;
import net.sf.freecol.common.i18n.Messages;


/**
 * A dialog for choosing a file to load.
 */
public final class LoadDialog extends FreeColDialog< File >
{

    /** Fake file for the cancel selection. */
    private static final File cancelFile = new File( "" );


    /**
     * Creates a dialog to choose a file to load.
     *
     * @param freeColClient The <code>FreeColClient</code> for the game.
     * @param frame The owner frame.
     * @param directory The directory to display when choosing the file.
     * @param fileFilters The available file filters in the dialog.
     */
    public LoadDialog( FreeColClient freeColClient, JFrame frame,
                       File directory, FileFilter[] fileFilters )
    {
        super( freeColClient, frame );

        final JFileChooser fileChooser = new JFileChooser( directory );
        if ( fileFilters.length > 0 )
        {
            for ( FileFilter fileFilter : fileFilters )
            {
                fileChooser.addChoosableFileFilter( fileFilter );
            }
            fileChooser.setFileFilter( fileFilters[ 0 ] );
            fileChooser.setAcceptAllFileFilterUsed( false );
        }
        fileChooser.setControlButtonsAreShown( true );
        fileChooser.setApproveButtonText( Messages.message( "ok" ) );
        //fileChooser.setCancelButtonText(Messages.message("cancel"));
        fileChooser.setDialogType( JFileChooser.OPEN_DIALOG );
        fileChooser.setFileSelectionMode( JFileChooser.FILES_ONLY );
        fileChooser.setFileHidingEnabled( false );
        fileChooser.addActionListener( ( ActionEvent ae ) ->
                                       {
                                           final String cmd = ae.getActionCommand( );
                                           File value = ( JFileChooser.APPROVE_SELECTION.equals( cmd ) )
                                                   ? ( ( JFileChooser ) ae.getSource( ) ).getSelectedFile( )
                                                   : cancelFile;
                                           setValue( value );
                                       } );

        List< ChoiceItem< File > > c = choices( );
        initializeDialog( frame, DialogType.QUESTION, true, fileChooser, null, c );
    }


    /**
     * {@inheritDoc}
     */
    @Override
    public File getResponse( )
    {
        File value = ( File ) getValue( );
        return ( value == cancelFile ) ? null : value;
    }
}
